Polishing apparatus



(No Model.) t

, J. KAI-IL.

v PoLIsHING APPARATUS. 19.258,076. Patented May 1e, 1882.

N. PETERS, FvIwlLnmgnyh-n wnshinglun. D. C.

UNITED STATES PATENT OFFICE. 1

JOHN KAHL, OF \VALLINGFORD, CONNECTICUT.

POLISHING APPAFtATUS SPECIFICATION forming part of Letters Patent No. 258,076, dated May 16, 1882.

l Application filed March 1T, 1882. (No model.) l

To alt whom it may concern: j

vBe it known that I, JOHN KAHL,of Wallingford, in the county ofNew Haven and State of Connecticut, have invented a new Improvement in Polishing Apparatus 5 and I do hereby decla-re the following, when taken in 'connection with accompanying drawing and the letters of'reference marked thereon, to be a full, clear, and exact description ot' the same, and which said drawing constitutes part of this specification, and represents a side view.

This invention relates to a device for polishing or cutting down thin plates or strips of me tal--such, for instance, as blanks forlforks and spoons, knife-blades, and like articles.

The usual method of do'n-g this class of work is for a skillful workman to apply the blank to a grinding or polishing wheel iirst one side and then the other; but this requires the utmost skill in order to produce a perfectly-flat surface. Again, the surface of the grindingwheel wears awayrapidly, and as the diameter decreases the greater skilLis required. In some cases an endless belt has been used, having its outer face coated with the polishing` material; but in such arrangement the great difficulty of polishing but one side at a time exists.

The object of my invention is the construction of a device readily adjustable to different thicknesses, and whereby both surfaces may be ground and polished at the same time without the necessary employment of the skilled workmen required in the usual method; and the invention consists in an endless rapidlyrunning band having its surface coated with the polishing material and passing around a pair ot' drums, and between thedrums led to another distant drum, whereby the band will present the same working-face on the two drums adjacent to each other, and so that the work introduced between the said adjacent surfaces of the band will receive the action of the band upon both its surfaces, as more fully hereinafter described. p

A represents the table on which the apparatus is arranged. B is the main ,or driving pulley, to which the power is applied through a pulley, C, or any convenient manner, to impart a rapid revolution thereto. D is the pulley or drum, arranged at a convenient position near the front of the table. E is aseeondpulley or drum, corresponding to the drum D, ari ranged with its axis parallel to the axis of the drum D. Fis a third drum, arranged in aline between the axis of the two drums D E, but carried back toward the driving-pulley B.

The band a. is made from any suitable ilexible material, and has one surface coated with a grinding or coating material-such, for instance, as emery, or what is commonly called vulcanite,77 and which will out the metal with which it comes in contact. This band passes around the driving-pulley B, over the drum D, backward and around the drum F, forward and A around the d rum E, thence to the pulley B, and

so that the outer surface of the bandis presented between the two drums D E. Hence the metal introduced between the two runs of the band will come in contact with the two working-surfaces of the band', the one running in one direction and the other in the opposite direction, and thus operate upon the two surfaces of the metal at the same time without any tendency to draw that metal in either direction, the strain coming upon one side counteraeting the strain coming upon the other side.

In order to adapt the apparatus to varying thicknesses of metal to be ground, one of the drums-say E-is hung by an arm,.b, upon a pivot, d, so as to bc readily moved toward or from the other drum, D, and this movement may be imparted by the foot of a workman on a treadle, H, through a connecting-rod, I, as shown, orv otherwise; or, if preferred, the two drums D E may be adjustable each toward the other, whereby the two working-surfaces of the band may be brought nearer together or fartherfrom each other, according to the thickness of the metal to be operated upon.

The two drums D E may be set at a prede-` termined distance from each other, correspondin g to the thickness of the metal to be operated upon, so that the operator has simply to pass the piece of metal to be polished inward between the two working-surfaces ofthe band, and once passed through the work is done, and this may be done by any person unskilled in the art of grinding or polishing. The band running in opposite directions prevents any part of the piece being accidentally taken from IOO the hand of the'operator, or any irregular grinding, as must be the oase where thc grinding surface runs in one direction only.

What I claim isp l. The combination of the two drums D E, the intermediate drum, F, and the endless d riveu band a, having its surface coated with the grinding or polishing material and running around one of the said drums, D, thence around the intermediate drum, F, thence around the other drum, E, whereby the same workngsurface ot' the band is presented between the two drums D E opposite to each other, with mechanism, substantially such as described7 to impart; to said drums a rapidrevolution, and to the said band a corresponding rapid and constant movement, substantially as described. l

2. The combination of the two drumsfD E, the intermediate drum, F, and the endless driven band a, having its surface coated with the grinding` or polishing material, and running,1 around one ofthe said drums D, thence around the intermediate drum,F, the-nce around the other drum, E, whereby the same working-surface of the band is presented between the two drums D E opposite to each other,one or both of the said drums D E made adjustable to vary the distance between the working-surfaces of the band, substantially as described.

JOHN KAHL.

Witnesses:

JOHN E. EARLE, Jos. G. EARLE. 

